Table 3.
Spectral features detected in the S region.
| Line | BB | Ref. wavelength | Det. wavelength | Line flux | Velocity |
|---|---|---|---|---|---|
| α | (Å) | (Å) | (ph s−1 cm−2 × 10−5) | (km s−1) | |
| S XVI Lyα | 12 | 4.7329 (a) | 4.731 ± 0.003 |
 |
 |
| S XVr | 27 | 5.0386 |
 |
 |
 |
| S XVi | 27 | 5.0666 |
 (b) |
0.14 ± 0.03 | =v(Sxv r) |
| S XVf | 27 | 5.1013 |
 (b) |
 |
=v(Sxv r) |
| S XIV | 27 | 5.0858 | 5.081 ± 0.003 | 2.3 ± 0.8 |
 |
| S XI/Si XIV Lyβ(c) | 27 | 5.2250 | 5.224 ± 0.002 |
 |
−70 ± 140 |
| S IX | 2.7 | 5.3163 |
 |
 |
 |
| S II-VIII | 27 | 5.3616 | 5.365 ± 0.003 |
 |
200 ± 150 |
| 2.2 | – |
 |
 |
– | |
| Si XIII Heβ | 8 | 5.681 (d) | 5.683 ± 0.003 |
 |
 |
Notes. For each feature we report the detection parameter α, the best-fit values (wavelength and line flux), and the Doppler velocities, computed using reference wavelengths measured by Hell et al. (2016). Line widths were fixed to 0.003 Å for all the lines. Hell et al. (2016) reports the statistical uncertainties for each energy, which correspond to an error in wavelength of the order of 10−4 − 10−5 Å. However, the authors state that there is also a systematic uncertainty of 0.23 eV for S lines, which results in an error on the wavelength of 0.0008 Å.
Distances between the r line and the i and f lines computed from Drake (1988).
The reference wavelength of Si XIV Lyβ is 5.217 Å (Erickson 1977).
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